Answer:
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I'll try to explain, because I've had tubes before. In fact, I still have them.
For me, tubes were put in because of too many ear infections, and excessive water in my ear. The tube helped drain the water out. You can see A picture I have in a file. The tubes can be put I believe in the ear drum. They're put there to help drain water that has trouble getting out on its own.
In a survey, it says that human's DNA are 99% the same.
Hope this helps! :)
Aerobic respiration to lactic acid fermentation, lactic acid is the reason your muscles get sore after a workout
Hope this helps.
5 is adaptation, 7 is transpiration